JP2013046561A - Power transmission device - Google Patents

Power transmission device Download PDF

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Publication number
JP2013046561A
JP2013046561A JP2011185204A JP2011185204A JP2013046561A JP 2013046561 A JP2013046561 A JP 2013046561A JP 2011185204 A JP2011185204 A JP 2011185204A JP 2011185204 A JP2011185204 A JP 2011185204A JP 2013046561 A JP2013046561 A JP 2013046561A
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Japan
Prior art keywords
coil
power
power transmission
frequency
transmission device
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Abandoned
Application number
JP2011185204A
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Japanese (ja)
Inventor
Hiroki Kudo
浩喜 工藤
Noritaka Deguchi
典孝 出口
Kisho Odate
紀章 大舘
Kenichiro Ogawa
健一郎 小川
Tooru Tsukasagi
徹 司城
Akiko Yamada
亜希子 山田
Shuichi Obayashi
秀一 尾林
Hiroki Shiyouki
裕樹 庄木
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Toshiba Corp
株式会社東芝
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Priority to JP2011185204A priority Critical patent/JP2013046561A/en
Publication of JP2013046561A publication Critical patent/JP2013046561A/en
Application status is Abandoned legal-status Critical

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    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/0008General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077Constructional details, e.g. mounting of circuits in the carrier
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J17/00Systems for supplying or distributing electric power by electromagnetic waves
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/40Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/70Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/80Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/90Circuit arrangements or systems for wireless supply or distribution of electric power involving detection or optimisation of position, e.g. alignment
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/022Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters characterised by the type of converter
    • H02J7/025Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters characterised by the type of converter using non-contact coupling, e.g. inductive, capacitive

Abstract

PROBLEM TO BE SOLVED: To provide a space-saving power transmission device capable of performing both power transmission and wireless communications with high efficiency.SOLUTION: A power transmission device according to an embodiment transmits a power signal having a frequency same as an oscillation frequency of a coil and an information signal having a frequency different from the oscillation frequency of the coil via the coil.

Description

  One aspect of the present disclosure relates to wireless power transmission.

  In the wireless power transmission technology, communication for controlling power transmission is performed in order to adjust power supply and prevent erroneous power feeding to foreign objects. In order to save space, there is a method of using a power transmission coil as an antenna for wireless communication.

JP 2011-29799 A

  An object of one embodiment of the present invention is to perform both power transmission and wireless communication in a space-saving and highly efficient manner.

  In order to achieve the above object, a power transmission device according to an embodiment of the present invention includes a first coil, a drive unit, and a communication unit. The first coil resonates at the first frequency and sends power. The drive unit generates a power signal having a first frequency. The communication unit generates an information signal having a second frequency different from the first frequency. Both the power signal and the information signal are sent through the first coil.

The block diagram which shows the structure of the electric power transmission system which concerns on 1st Embodiment. The block diagram which shows the structure of the electric power transmission system which concerns on the modification of 1st Embodiment. The block diagram which shows the structure of the power transmission apparatus which concerns on 1st Embodiment. The block diagram which shows the structure of the power transmission apparatus which concerns on 1st Embodiment. 1 is a block diagram showing a configuration of a power receiving device 100A according to a first embodiment. The block diagram which shows the structure of the power transmission apparatus which concerns on 1st Embodiment. The figure which shows a radiation efficiency characteristic. The block diagram which shows the structure of the power transmission apparatus which concerns on 2nd Embodiment. The block diagram which shows the structure of the power transmission apparatus which concerns on 2nd Embodiment. The block diagram which shows the structure of the power transmission apparatus which concerns on 2nd Embodiment. The block diagram which shows the structure of the power transmission apparatus which concerns on 3rd Embodiment. The block diagram which shows the structure of the power transmission apparatus which concerns on 4th Embodiment. The figure which shows the theoretical efficiency in the electric power transmission of a magnetic resonance system. The block diagram which shows the structure of a variable circuit.

  Hereinafter, embodiments of the present invention will be described.

(First embodiment)
FIG. 1 shows a power transmission system according to the first embodiment. This power transmission system can realize long-distance power transmission by magnetic resonance type wireless power transmission. Further, the present invention can be similarly applied to other than the magnetic resonance type wireless power transmission. The power transmission system includes a power transmission device 100 having a power transmission coil 10 and a power reception device 100A having a power reception coil 10A. The power transmission coil 10 and the power reception coil 10A may be any coil that resonates at the first frequency. The power transmission coil 10 and the power reception coil 10A are, for example, a self-resonant coil, a coil that resonates by adding at least one of a capacitor or an inductor, and the shape thereof is arbitrary. The number of turns of the power transmission coil 10 and the power reception coil 10A may be one turn (loop shape) or a plurality of turns.

  The power transmission device 100 and the power reception device 100A can perform wireless (non-contact) power transmission and wireless communication. The frequency of a signal for power transmission (hereinafter referred to as a power signal) is different from the frequency of a signal for wireless communication (hereinafter referred to as an information signal). The power transmission device 100 and the power reception device 100A can simultaneously perform power transmission and wireless communication. The power transmission device 100 includes a drive unit 20 and a communication unit 30. The power receiving apparatus 100A includes a load unit 20A and a communication unit 30A. The power signal generated by the drive unit 20 is transmitted via the power transmission coil 10 and the power reception coil 10A and consumed by the load unit 20A. An information signal generated by one of the communication units 30 / 30A of the power transmission device 100 or the power reception device 100A is transmitted via the power transmission coil 10 and the power reception coil 10A, and the other of the communication units 30 / 30A of the power transmission device 100 or the power reception device 100A is transmitted. The information signal is received.

  FIG. 2 shows a power transmission system according to a modification of the first embodiment. As shown in FIG. 2A, the power transmission device 100 may have a plurality of power transmission coils 10, and the power reception device 100A may have a plurality of power reception coils 10A. As shown in FIG. 2B, the power transmission side may be a power transmission system having a plurality of power transmission devices 100, and the power reception side may be a power reception system having a plurality of power reception devices 100A. The resonance frequency, path length, or electrical length of each power transmission coil 10 and each power reception coil 10A can be the same or different.

  FIG. 3 shows the power transmission device 100 according to the first embodiment. The power transmission device 100 includes a power transmission coil 10, a drive unit 20, and a communication unit 30. The power transmission coil 10 is commonly used as an antenna for power transmission and an antenna for wireless communication. The resonance frequency of the power transmission coil 10 is the first frequency.

  The drive unit 20 generates a signal for transmitting power. The drive unit 20 generates a voltage or current power signal (hereinafter referred to as a first frequency power signal) including at least the first frequency or a frequency in the vicinity of the first frequency.

  The communication unit 30 generates a signal for wireless communication. The communication unit 30 generates a voltage or current information signal (hereinafter, information signal of the second frequency) including at least the second frequency or a frequency in the vicinity of the second frequency. The second frequency is different from the first frequency. The communication unit 30 performs processing for other wireless communication, for example, modulation / demodulation, encoding / decoding, and the like.

  In the example of FIG. 3, the coupler 41 is provided, but the power transmission device 100 according to the first embodiment can include a protection circuit between the power transmission coil 10 and the communication unit 30. The protection circuit prevents / suppresses that the communication unit 30 is mixed with high-power noise such as a power signal, causing a deterioration in transmission rate or damage to equipment. The protection circuit may be any circuit as long as the power signal flowing through the power transmission coil 10 can be prevented from flowing out to the communication unit 30. For example, the protection circuit includes a coupler 41, a bandpass filter (BPF) 42, a capacitor, and the like. When power is transmitted, the protection circuit combines the power signal and the information signal. When receiving power, the protection circuit separates the power signal and the information signal. The coupler 41 desirably has a frequency characteristic that blocks the first frequency related to the power signal and passes the second frequency related to the information signal.

FIG. 4 shows an example in which the protection circuit is a coupler 41 and a bandpass filter 42. The coupler 41 desirably has the aforementioned characteristics. The bandpass filter 42 preferably has a frequency characteristic that blocks a frequency that is an integral multiple of the first frequency (abbreviated as f 1 in the figure) and passes the second frequency (abbreviated as f 2 in the figure).

  The power transmission device 100 according to the first embodiment can further include a control unit (not shown). The control unit controls the drive unit 20 and the communication unit 30 to control the start or stop (timing) of power transmission and wireless communication. The control unit may determine information (such as control information for power transmission) to be exchanged between the power transmission device 100 and the power reception device 100A in the communication unit 30, and the drive unit 20 according to the control information. You may control the magnitude | size of the electric power signal to produce | generate, electric power transmission amount, etc.

  FIG. 5 shows a power receiving device 100A according to the first embodiment. The power receiving device 100A includes a power receiving coil 10A, a load unit 20A, and a communication unit 30A. The power receiving coil 10A is commonly used as an antenna for power transmission and an antenna for wireless communication. The resonance frequency of the power receiving coil 10A is the first frequency. The load unit 20A is connected to an arbitrary one such as one that consumes or accumulates the power transmitted from the power transmission device 100. The communication unit 30A, the protection circuit, and the control unit are the same as described above for the power transmission circuit.

  FIG. 6 shows a specific example of the power transmission device 100 according to the first embodiment. The power transmission device 100 includes a drive unit 20, a communication unit 30 (not shown), a power supply coil 50, and a power transmission coil 10. The drive unit 20 is directly connected to the power supply coil, and the communication unit 30 is connected via a protection circuit (not shown). The feeding coil 50 and the power transmission coil 10 are electromagnetically coupled. The feeding coil 50 may be a coil that resonates at the second frequency. Although the frequency at which the feeding coil 50 resonates depends on the shape of the feeding coil 50, it is in the vicinity of a frequency having a wavelength that is 1 / integer times the path length and electrical length of the feeding coil 50. When the feeding coil 50 is used as an antenna using the second frequency, the radiation efficiency is generally high. The power supply coil 50 may have an arbitrary shape as in the case of the power transmission coil 10 or the power reception coil 10A, and may be wound once or multiple times.

  The power signal generated by the drive unit 20 may be indirectly supplied to the power transmission coil 10 via the power supply coil 50. The power signal may be directly fed to the power transmission coil 10. The power transmission coil 10 may be less than 100, for example, has a high Q value of 100 or more. The information signal generated by the communication unit 30 is supplied to the power feeding coil 50 through the protection circuit. By changing the coupling between the power feeding coil 50 and the power transmitting coil 10, impedance matching between the power transmitting apparatus 100 and the power receiving apparatus 100A can be achieved.

  The frequency used for power transmission is near the resonance frequency (first frequency) of the power transmission coil 10 and the power reception coil 10A. In the vicinity of the resonance frequency of the power transmission coil 10 and the power reception coil 10A, a strong coupling state is created by resonating the power transmission coil 10 and the power reception coil 10A through a nearby electromagnetic field, and there is little loss from the power transmission coil 10 to the power reception coil 10A. The power is transmitted at. At this time, power transmission can be realized with the smallest radiation loss and conductor loss radiated as radio waves.

  The frequency used for wireless communication is in the vicinity of the resonance frequency (second frequency) of the feeding coil 50. The communication unit 30 performs communication using the radio wave radiated from the power transmission coil 10 as a medium. The frequency of the information signal generated by the communication unit 30 includes a frequency at which the power transmission coil 10 radiates the information signal as a radio wave with high efficiency (a frequency with high radio wave radiation efficiency).

  FIG. 7 shows frequency characteristics of radio wave radiation efficiency according to a specific example of the power transmission device 100 shown in FIG. 6. Here, FIG. 7 shows that the feeding coil 50 has a loop shape with one turn and the resonance frequency at which the path length becomes one wavelength is about 330 MHz, and the power transmission coil 10 has a plurality of turns and the power transmission coil 10. This is a simulation result assuming a configuration in which the resonance frequency determined by the inductance and capacitance that can be held is about 13.56 MHz. FIG. 7 shows the frequency characteristics of the radio wave radiation efficiency of the power feeding coil 50 (loop shape) only (indicated by a solid line) and the frequency characteristics of the radio wave radiation efficiency of the power feeding coil 50 (loop shape) and the power transmission coil 10 (by the dotted line). Display). In this simulation, reflection loss is taken into consideration.

  The radiation efficiency in the vicinity of the resonance frequency (13.56 MHz) of the power transmission coil 10 and the power reception coil 10A is very low. The radiation efficiency in the vicinity of the resonance frequency (about 330 MHz, about 660 MHz,...) Of the feeding coil 50 is high.

  The frequency at which the radiation efficiency of only the feeding coil 50 is maximized and the frequency at which the radiation efficiency of the feeding coil 50 and the power transmission coil 10 are maximized are close to each other and are substantially the same. The radiation efficiency becomes maximum at a frequency (about 330 MHz in the example of FIG. 7) at which the path length or electrical length of the feeding coil 50 is one wavelength. The radiation efficiency is maximized at a frequency at which the path length or electrical length of the feeding coil 50 is 1 / integer of the wavelength (about 330 MHz, about 660 MHz... In the example of FIG. 7). The frequency with high radio wave radiation efficiency is determined by the resonance frequency, path length, or electrical length of the feeding coil 50. The loop-shaped feeding coil 50 terminated at both ends resonates at a frequency at which the path length or electrical length is one wavelength. The feeding coil 50 having another shape resonates in the vicinity of a frequency having a wavelength that is an integral number of a path length or an electrical length. High radiation efficiency can be obtained by using these resonance frequencies.

Frequency (frequency of the power signal driver 20 is generated) to be used for power transmission is desirably efficient high frequency power transmission, the resonant frequency f 1 frequency near the power transmission coil 10. Frequency used for wireless communication (frequency of the communication unit 30 the information signal to generate) is a high frequency unwanted radiation efficiency of radio waves, a resonant frequency f 2 frequency near the power supply coil 50. By determining the frequencies of the power signal and the information signal in this way, the power transmission coil and the antenna for wireless communication can be shared to save space, and both high-efficiency power transmission and wireless communication can be achieved. Can be realized.

Such as when the load of the load portion 20A of the power receiving side is changed, the harmonic of the resonance frequency f 1 of the power transmission coil 10 is to be generated. By supplying the information signal generated by the communication unit 30 to the power transmission coil 10 via the protection circuit, it is possible to reduce the influence of noise of harmonic components of the power signal on the communication unit 30.

The resonance frequency f 2 of the feeding coil 50, it is possible to determine the resonance frequency of the feeding coil 50 so as not integral multiples of the resonance frequency f 1 of the power transmission coil 10 (the path length or electrical length). Thereby, the influence of the harmonic noise by the electric power signal to the communication part 30 can be reduced by the filtering effect of the feeding coil 50.

Than only configuration feed coil 50, towards the configuration using the feed coil 50 and the power transmission coil 10 is achieve high radiation efficiency at the resonance frequency f 2 of the power supply coil 50 (FIG. 7). This is because the Q value of the whole antenna (the power feeding coil 50 and the power transmission coil 10) is increased by the presence of the power transmission coil 10 having a high Q value in front of the power feeding coil 50.

  The maximum value of the radiation efficiency is higher in the configuration of the feeding coil 50 and the power transmission coil. However, the communication bandwidth dropped by 3 dB is about 100 MHz for the configuration of the feeding coil 50 alone, whereas the configuration of the feeding coil 50 and the power transmission coil 10 is about 45 MHz. The configuration with only the feeding coil 50 has a wider communication bandwidth.

  The frequency with high radiation efficiency is determined not only by the path length of the feeding coil 50 but also by the electrical length of the feeding coil 50 by adding a capacitor or the like to the feeding coil 50. By adding a capacitor or the like to the feeding coil 50, a frequency with high radiation efficiency can be changed. For example, by setting a frequency with high radiation efficiency as a frequency band of an existing wireless communication system (for example, a wireless LAN), the communication unit 30 can be of an existing wireless communication system.

  The control unit included in the power transmission device 100 according to the first embodiment can perform the following procedure by wireless communication with the power reception device 100A before starting power transmission. The processing to be performed before power transmission includes (1) confirmation of a power reception request from the power receiving side, (2) ID (Identification) authentication for countermeasures against theft, (3) confirmation of power requested by the power receiving side, (4) power Adjustment for high efficiency of transmission, (5) Confirmation of whether or not required power by trial transmission is satisfied. Any one or more of steps (1) to (5) may not be performed. The power transmission device 100 can simultaneously perform power transmission and wireless communication via the same antenna (power transmission coil 10). The control unit can perform adjustment for high efficiency of power transmission during power transmission.

  Since the antenna for power transmission and wireless communication is shared, the control unit can collect parameters used for power transmission based on the frequency characteristics of information signals and the like by wireless communication before power transmission.

  The control unit can estimate the distance between the power transmission coil 10 and the power reception coil 10A from the received power of the information signal. Since the antenna for power transmission and wireless communication is shared, the transmission distance between the power transmission coil 10 and the power reception coil 10A when performing power transmission and wireless communication is the same. When power transmission is performed, it is expected that the power transmission coil 10 and the power reception coil 10A are often in a line-of-sight environment. Therefore, the propagation loss of direct waves in wireless communication is almost equivalent to the loss due to distance attenuation. The transmission distance between the power transmission coil 10 and the power reception coil 10A can be estimated from the propagation loss of the information signal related to wireless communication. Assuming that the distance is r assuming that it is a free space, it is known that the far field is attenuated by the square of the distance and the frequency. Therefore, the distance between the power transmission coil 10 and the power reception coil 10A can be estimated from the frequency used for wireless communication and the received power of the information signal.

  The control unit can estimate the coupling coefficient k between the power transmission coil 10 and the power reception coil 10A from the estimated distance between the power transmission coil 10 and the power reception coil 10A. The coupling coefficient k depends not only on the distance between the power transmitting coil 10 and the power receiving coil 10A but also on the positional relationship and the angular relationship (direction) between the power transmitting coil 10 and the power receiving coil 10A. The control unit can estimate the coupling coefficient k using the estimated distance between the power transmitting coil 10 and the power receiving coil 10A by assuming the positional relationship and the angular relationship (direction) between the power transmitting coil 10 and the power receiving coil 10A. The control unit can estimate the coupling coefficient k using a correspondence table between the distance between the power transmission coil 10 and the power receiving coil 10A corresponding to the system and the coupling coefficient k.

The control unit can estimate the maximum value of the theoretical transmission efficiency during power transmission from the coupling coefficient k between the power transmission coil 10 and the power reception coil 10A. The transmission efficiency is calculated by the following formula.

  The control unit indicates the Q value of the power transmission coil 10 as Q1, the Q value of the power reception coil 10A as Q2, and the coupling coefficient as k.

  The control unit can estimate the received power on the power receiving apparatus 100A side during power transmission from the estimated transmission efficiency and transmitted power. When estimating the received power on the power receiving device 100A side, the control unit does not need to confirm whether or not (5) the required power by the trial power transmission is satisfied.

  The control unit may use a fixed threshold when determining whether or not the power requested by the power receiving side can be transmitted, and uses the threshold of the requested power received from the power receiving apparatus 100A via the communication unit 30. May be. The control unit can determine whether or not power transmission is possible by comparing the received power on the power receiving apparatus 100A side during the trial power transmission or the estimated result of the received power with the threshold value. When the received power on the power receiving apparatus 100A side is equal to or greater than the threshold, the control unit determines that power can be received and can start or continue charging. When the received power on the power receiving apparatus 100A side is less than the threshold value, the control unit determines that power cannot be received and can stop charging. When it is determined that power cannot be received, the control unit can notify the user that power cannot be received, that the power transmission device 100 and the power reception device 100A need to be brought closer, and that the positional relationship needs to be adjusted.

  In the first embodiment, as illustrated in the example of FIG. 6, the example in which both the feeding coil 50 and the power transmission coil 10 are used has been described, but only the power transmission coil 10 can be used (FIG. 3, FIG. 4, etc.). The drive unit 20 generates a power signal having a resonance frequency (first frequency) of the power transmission coil 10. The communication unit 30 generates an information signal of a second frequency that is different from the first frequency and has a higher radiation efficiency than the radiation efficiency at the first frequency. The frequency with high radiation efficiency (second frequency) is determined by the self-resonance frequency of the power transmission coil 10 or the resonance frequency depending on the electrical length / path length. By doing in this way, the feeding coil 50 becomes unnecessary, and further space saving (miniaturization of the power transmission device 100) can be realized.

(Second Embodiment)
In the first embodiment, the specific example in which the driving unit 20 and the communication unit 30 are connected to the power feeding coil 50 has been described. However, the drive unit 20 can be directly connected to the power transmission coil 10 and the communication unit 30 can be connected to the power supply coil 50.

  FIG. 8 is a diagram illustrating a power transmission device 200 according to the second embodiment. FIG. 9 is a diagram illustrating a configuration in which the power transmission device 100 according to the second embodiment includes a protection circuit. The drive unit 20 is connected to the power transmission coil 10. The communication unit 30 is connected to the power feeding coil 50. The power transmission coil 10 and the power feeding coil 50 are electromagnetically coupled. A protection circuit can be inserted between the communication unit 30 and the feeding coil 50. The power receiving device can be realized by replacing the drive unit 20 with the load unit 20A, as in the first embodiment. The power transmission coil 10, the power feeding coil 50, the drive unit 20, the communication unit 30, the protection circuit (coupler 41, bandpass filter, etc.), and the load unit 20A are the same as those in the first embodiment, and therefore the same numbers are used. A description thereof will be omitted.

  FIG. 10 shows a specific example of the power transmission device 200 according to the second embodiment. Unlike the specific example (FIG. 6) according to the first embodiment, the drive unit 20 is connected to the power transmission coil 10 instead of the power supply coil 50. Except for the connection relationship between the drive unit 20 and the coil, this is the same as the specific example according to the first embodiment.

  The frequency characteristics of radio wave radiation efficiency are the same as those in FIG. Therefore, similarly to the power transmission device 100 according to the first embodiment, by determining the frequencies of the power signal and the information signal, it is possible to save space by sharing the coil for power transmission and the antenna for wireless communication. Therefore, it is possible to achieve both high-efficiency power transmission and wireless communication. Moreover, the modification disclosed in the first embodiment can be applied.

(Third embodiment)
The power transmission device 300 according to the third embodiment is different from the first and second embodiments in that it further includes a transmission power control unit 60 that controls transmission power by the communication unit 30. The control unit according to the first embodiment may be the same as or different from the control unit.

  FIG. 11 shows a power transmission device 300 according to the third embodiment. The power transmission device 300 according to the third embodiment further includes a transmission power control unit 60. The transmission power control unit 60 controls transmission power when the communication unit 30 transmits an information signal during wireless communication. The transmission power control unit 60 may control the transmission rate of the information signal. It is desirable to perform power transmission with high efficiency, and the distance over which power can be transmitted is determined by a threshold value. When the power transmission side and the power reception side share the power transmission antenna and the wireless communication antenna, it is only necessary that the power transmission distance and the wireless communication distance are the same. When only the wireless communication distance is larger than the power transmission distance, a part of the power related to the wireless communication is wasted. For example, when 10 W is a threshold value, it is only necessary to be able to perform wireless communication within a distance range in which the received power can achieve 10 W or more, and unnecessary information even if an information signal can be received by wireless communication at a distance of 10 W or less. It may become.

  The transmission power control unit 60 controls the transmission power of the information signal related to wireless communication so that reception of the information signal is not possible at a distance (range) where the received power is less than the threshold. Thereby, power consumption can be reduced. The transmission power control unit 60 may control the transmission power upon receiving notification of the reception power of the information signal at the power receiving apparatus. The transmission power control unit 60 may decrease the transmission power Ps that is initially set by ΔP step by step, and set the transmission power immediately before receiving a notification that the reception of the information signal has failed from the power receiving apparatus.

  The communication unit 30 can vary the transmission rate when transmitting information. Thereby, it is also possible to realize communication at a high transmission rate in a state where a high SN ratio can be obtained. In a state where the S / N ratio is not sufficient, it is possible to reduce the transmission rate and improve noise resistance.

(Fourth embodiment)
The power transmission device 400 according to the fourth embodiment is different from the first, second, and third embodiments in that it further includes a variable circuit 70 for changing the Q value of the power transmission coil 10. The power receiving circuit may include the same variable circuit 70. The Q value of the variable circuit 70, that is, the power transmission coil 10, may be controlled by the same control unit as the control units according to the first and third embodiments (hereinafter referred to as the Q value control unit) or controlled by the user. Also good.

  FIG. 12 shows a power transmission device 400 according to the fourth embodiment. The power transmission device 400 according to the fourth embodiment further includes a variable circuit 70. The variable circuit 70 changes the Q value of the power transmission coil 10. The power transmission apparatus 100 can further include a Q value control unit (not shown). The Q value control unit controls the variable circuit 70 using at least one of the power transmission priority and the wireless communication priority, and controls the Q value of the power transmission coil 10.

FIG. 13 shows a theoretical formula of power transmission efficiency according to Equation 1. The power transmission efficiency is a monotonically increasing function of k 2 Q 1 Q 2 which is the product of the square of the coupling coefficient k and Q 1 and Q 2 which are the Q values of the power transmission coil 10 and the power reception coil 10A. By increasing the Q value (Q 1 , Q 2 ) of the power transmission / reception coil, the power transmission efficiency can be improved. However, when the Q value (Q 1 , Q 2 ) of the power transmission / reception coil is high, the frequency characteristic of the radio wave radiation efficiency has a sharp peak. In that case, the frequency band with high radio wave radiation efficiency (band that can be used for radio communication: communication band) becomes a narrow band, which may reduce the transmission rate.

  The power transmission priority and the wireless communication priority may be expressed in binary (high / low) and ternary (high / medium / low), respectively. The sum of the priority of power transmission and the priority of wireless communication may be expressed as 100. The Q value control circuit controls the Q value of the power transmission coil 10 by the variable circuit 70 in accordance with at least one of the priority of power transmission and the priority of wireless communication, so that the efficiency of power transmission and the transmission rate of wireless communication are controlled. And can be changed.

When the communication unit 30 receives a notification that the battery level of the power receiving apparatus is less than or equal to the first threshold (battery level: low), the Q value control unit sets the priority of power transmission to 100, and the variable circuit 70 , The Q value of the power transmission coil 10 can be maximized. When the communication unit 30 receives a notification that the remaining battery level of the power receiving apparatus is greater than the second threshold (a value greater than the first threshold) (remaining battery level: large or fully charged), the Q value control unit performs wireless communication. , And the variable circuit 70 can minimize the Q value of the power transmission coil 10. In this way, the Q value control unit can realize power transmission and wireless communication according to the status of the power receiving device. The power transmission priority and the wireless communication priority are not limited to the battery state of the power receiving device, Designation from the power receiving apparatus may be received, it may be set according to whether or not it is before the start of power transmission, or may be set by the user.

  FIG. 14 shows the variable circuit 70. As shown in FIG. 14, the variable circuit 70 can change the Q value of the power transmission coil 10 by adding resistors having different resistance values to the power transmission coil 10. In this case, the Q value of the power transmission coil 10 can be changed without changing the resonance frequency of the power transmission coil 10.

  The variable circuit 70 may add a capacitor (C) having a different capacitance value, and the Q value of the power transmission coil 10 can be changed by adding an inductor (L) having a different inductance value.

In this case, although the resonance frequency of the power transmission coil 10 can be changed, the Q value control unit does not change the resonance frequency of the power transmission coil 10 and changes at least the capacitance or inductance so as to change the Q value of the power transmission coil 10. One can be controlled.

  For example, when the priority of power transmission is extremely low (priority: 0), the Q value control unit can prevent heat generation by stopping power transmission and adding a large resistance.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined. Moreover, although the power transmission apparatus 100 was demonstrated to the example about 1st-4th embodiment, it is applicable to 100 A of power receiving apparatuses about structural requirements other than the drive part 20 for a power receiving efficiency improvement. Furthermore, a configuration having both functions of the power transmission devices 100, 200, 300, 400 and the power reception device 100A can be realized as the power transmission / reception device.

100, 200, 300, 400 ... power transmission device 100A ... power reception device 10 ... power transmission coil 10A ... power reception coil 20 ... drive unit 20A ... load unit 30, 30A ... communication unit 41 ... Coupler 42 ... Band pass filter 50 ... Feed coil 60 ... Power control unit 70 ... Variable circuit

Claims (8)

  1. A first coil for resonating at a first frequency and sending power;
    A driving unit for generating a power signal of the first frequency;
    A communication unit that generates an information signal of a second frequency different from the first frequency,
    The power transmission device, wherein the first coil transmits both the power signal and the information signal.
  2. A second coil electromagnetically coupled to the first coil;
    The communication unit outputs the information signal to the second coil,
    The power transmission device according to claim 1, wherein the second frequency is in the vicinity of a resonance frequency of the second coil or determined from a resonance frequency of the second coil.
  3.   The power transmission device according to claim 2, wherein the second frequency is a frequency determined from a reciprocal of an integral multiple of a path length or an electrical length of the second coil.
  4. A third coil electromagnetically coupled to the first coil;
    The resonance frequency of the third coil is different from the resonance frequency of the second coil.
    The power transmission device according to claim 2 or 3, wherein the communication unit outputs the information signal to at least one of the second coil and the third coil.
  5.   The first control unit that further controls whether to start power transmission by using the amount of power received on the power receiving device side estimated from the received power of the signal received by the communication unit. The power transmission device according to any one of 4.
  6.   5. The apparatus according to claim 1, further comprising a second control unit that controls transmission power of an information signal generated by the communication unit according to a reach distance of power transmitted through the first coil. The power transmission device described in 1.
  7.   7. The variable circuit according to claim 1, further comprising a variable circuit for changing a Q value of the first coil according to a priority of power transmission and wireless communication performed through the first coil. The power transmission device according to any one of claims.
  8. A first coil for resonating at a first frequency and receiving power;
    A load unit to which the power received by the first coil is supplied,
    The power receiving device, wherein the first coil receives both a power signal of the first frequency and an information signal of a second frequency different from the first frequency.
JP2011185204A 2011-08-26 2011-08-26 Power transmission device Abandoned JP2013046561A (en)

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JP2011185204A JP2013046561A (en) 2011-08-26 2011-08-26 Power transmission device
EP12160980A EP2562678A2 (en) 2011-08-26 2012-03-23 Transmitter and receiver
US13/434,398 US20130049481A1 (en) 2011-08-26 2012-03-29 Transmitter and receiver
KR1020120032316A KR20130023044A (en) 2011-08-26 2012-03-29 Transmitter and receiver

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KR20130023044A (en) 2013-03-07
US20130049481A1 (en) 2013-02-28

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